Column Pipe Installation; Pump Controller; Galvanic Separation; Thermal Switches - Grundfos S Serie Notice D'installation Et De Fonctionnement

6.5 Column pipe installation

Pumps for column pipe installation are installed permanently in a
column pipe. Grundfos does not normally supply the column pipe.
Dimensioning of the column pipes is suggested in the pump
specific dimensional drawings.
1. Fit the seat ring to the bottom of the column pipe.
2. Clean out debris from the pit.
3. Before lowering the pump into the column pipe, check the
cables visually for cuts or ruptures which may have been
caused by rough handling during transportation or installation.
4. Lower the pump into the column pipe by means of a certified
chain secured to the lifting bracket of the pump. The pump will
sit against the conical surface of the seat ring. Normally the
friction between the conical surfaces will prevent the pump
from rotating. As an extra precaution there are three guide
pins on the seat ring which will limit the possible rotation to
max. 60 °.
5. Hang up the end of the chain above or at the top of the
column pipe in such a way that the chain cannot come into
contact with the pump.
6. Adjust the length of the cables but remember to have enough
cable length to be able to service the pump. Make sure that
the cables are not sharply bent or pinched. Fix the cables in
such a way that there is no extra slack in the column pipe.
With long columns it may be necessary to arrange cable
support for the cable inside the column pipe. If necessary,
please contact Grundfos.
7. Connect the motor cables and the sensor cable.

6.6 Pump controller

S pumps, range 50-70 can be connected to a separate Grundfos
pump controller for level control, which is available as an
accessory:
• Grundfos Dedicated Controls (DC) for one to six pump
installations.
The Dedicated Controls system starts/stops the S pumps by
means of:
• float switches
• pressure sensor
• ultrasonic sensor.
Furthermore, it is possible to control the water level by both float
switches and an analog pressure sensor or ultrasonic sensor.
Optionally, DC can control a mixer. The Dedicated Controls
system can be extended with an IO 113 module per pump
(for S pumps with built-in sensor).
When installing the level switches, the following points should be
observed:
1. To prevent air intake and vibrations in submerged pumps, the
stop level switch must be fitted in such a way that the pump
is stopped before the liquid level is lowered below the top of
the pump housing.
As a principal rule for pumps in dry installation, the lowest
stop level must be at least 8" (200 mm) above the opening of
the suction pipe, see fig. 11.
2. The start level switch should be installed in such a way that
the pump is started at the required level; however, the pump
must always be started before the liquid level reaches the
bottom inlet pipe to the pit.
3. The high-level alarm switch, if installed, should always be
installed about 4" (100 mm) above the start level switch;
however, alarm must always be given before the liquid level
reaches the inlet pipe to the pit.
Warning
The pump controller must not be installed in
potentially explosive atmospheres.
Warning
Pumps installed in potentially explosive
atmosphere must always be filled with the
pumped liquid.
An additional level switch must be installed to
ensure that the pump is stopped in case the stop
level switch is not operating.

6.7 Galvanic separation

Double-insulated sensors for all measurements of high voltages
ensure the electrical safety. Furthermore, there is a galvanic
separation inside the IO 113.
6.8 IO 113
The IO 113 forms interface between a Grundfos sewage and
wastewater pump with analogue and digital sensors and the
pump controller. The most important sensor data are indicated on
the front panel.
One pump can be connected to an IO 113 module.
Together with the sensors, the IO 113 forms a galvanic separation
between the motor voltage in the pump and the controller
connected.
6.8.1 Measurement of insulation resistance
The IO 113 measures the insulation resistance between a stator
winding and earth:
• Resistance above 10 MΩ = ok.
• Resistance between 10 MΩ and 1 MΩ = warning.
• Resistance below 1 MΩ = alarm.

6.9 Thermal switches

Three bimetallic thermal switches are built into the stator
windings, and a contact will open in case of over temperature,
i.e. 302 °F (150 °C).
The supply voltage to the thermal switches must be 12-230 VAC.
The thermal switches are connected to the control cable, see
8. Electrical connection, and must be connected to the safety
circuit of the separate pump controller.
The motor-protective circuit breaker of the pump
controller must include a circuit which
Caution
automatically disconnects the power supply in
case the protective circuit for the pump is
opened.
Warning
The installer/user must install an automatic
circuit breaker which disconnects the power
supply in case the thermal switches or the
moisture switches are not operating.
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